JEE Main 2023 · PhysicsNumerical answerNumerical valueMediumCalculation

JEE Main 6 April 2023, Shift 2, Physics Q51

Question 51 of 90 in this shift, Physics question 21 of 30, Section B.

A body is dropped on ground from a height '

h_1

' and after hitting the ground, it rebounds to a height '

h_2

'. If the ratio of velocities of the body just before and after hitting ground is 4, then percentage loss in kinetic energy of the body is

\frac{x}{4}

. The value of

x

is __________.

Official answer

375

NTA final key.

Chapter: Work, Energy and Power
Topic: Collisions
Idea tested: Coefficient of Restitution

Same topic in other shifts

All Collisions questions

3 Apr 2025, Shift 2 · Q29Consider two blocks A and B of masses $m_1 = 10$ kg and $m_2 = 5$ kg that are placed on a frictionless table. The block A moves with a…MediumSingle correctHas a figure
4 Apr 2024, Shift 1 · Q35If a rubber ball falls from a height h and rebounds upto the height of h/2. The percentage loss of total energy of the initial system as…EasySingle correct
8 Apr 2024, Shift 1 · Q33A stationary particle breaks into two parts of masses $m_A$ and $m_B$ which move with velocities $v_A$ and $v_B$ respectively. The ratio…EasySingle correct
8 Apr 2024, Shift 1 · Q34A player caught a cricket ball of mass 150 g moving at a speed of 20 m/s. If the catching process is completed in 0.1 s, the magnitude of…EasySingle correct
9 Apr 2024, Shift 2 · Q33A nucleus at rest disintegrates into two smaller nuclei with their masses in the ratio of $2:1$ . After disintegration they will move :EasySingle correct
1 Feb 2024, Shift 1 · Q35A simple pendulum of length 1 m has a wooden bob of mass 1 kg. It is struck by a bullet of mass $10^{-2}$ kg moving with a speed of…MediumSingle correct

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.